公开(公告)号：US09697599B2

公开(公告)日：2017-07-04

申请号：US14742233

申请日：2015-06-17

Applicant: Xerox Corporation

Inventor： Prathosh A. Prasad ,  Lalit Keshav Mestha ,  Himanshu J. Madhu

IPC: G06T7/00 ,  A61B5/08 ,  A61B5/11 ,  A61B5/113 ,  A61B5/00 ,  G06K9/48 ,  G06K9/62 ,  G06K9/20 ,  G06T5/20 ,  G06T5/00

CPC classification number: G06T7/0012 ,  A61B5/0013 ,  A61B5/0816 ,  A61B5/0826 ,  A61B5/1128 ,  A61B5/1135 ,  A61B5/4818 ,  A61B5/746 ,  G06K9/00362 ,  G06K9/2054 ,  G06K9/481 ,  G06K9/6223 ,  G06T5/002 ,  G06T5/20 ,  G06T5/50 ,  G06T7/0016 ,  G06T2207/10016 ,  G06T2207/30061 ,  G06T2207/30076

Abstract: What is disclosed is a system and method for determining a subject's respiratory pattern from a video of that subject. One embodiment involves receiving a video comprising N≧2 time-sequential image frames of a region of interest (ROI) of a subject where a signal corresponding to the subject's respiratory function can be registered by at least one imaging channel of a video imaging device. The ROI comprises P pixels. Time-series signals of duration N are generated from pixels isolated in the ROI. Features are extracted from the time-series signals and formed into P-number of M-dimensional vectors. The feature vectors are clustered into K clusters. The time-series signals corresponding to pixels represented by the feature vectors in each cluster are averaged along a temporal direction to obtain a representative signal for each cluster. One of the clusters is selected. A respiratory pattern is determined for the subject based on the representative signal.

公开(公告)号：US10192307B2

公开(公告)日：2019-01-29

申请号：US15336475

申请日：2016-10-27

Applicant: Xerox Corporation

Inventor： Prathosh A. Prasad ,  Sanjay Bharadwaj ,  Pragathi Praveena ,  Tejaskumar Dipaklal Bengali ,  Satish Prasad Rath ,  Himanshu Jayantkumar Madhu

IPC: G06K9/00 ,  G06T7/00 ,  G06T7/20 ,  G06T5/00 ,  A61B5/00 ,  A61B5/024 ,  A61B5/08 ,  A61B5/11 ,  A61B5/113

Abstract: What is disclosed is a system and method for processing a video to extract a periodic signal which was captured by the video imaging device. One embodiment involves the following. First, a video of a subject in a scene is received. The video is acquired by a video imaging device. There is an underlying motion signal in the scene corresponding to cardiac or respiratory function. A time-series signal is generated for each pixel or for each group of pixels in a temporal direction across a plurality of image frames. Time-series signals of interest are selected. The selected time-series signals of interest are then processed to obtain a periodic signal corresponding to cardiac or respiratory function. The present method has a low computational complexity, is robust in the presence of noise, and finds its uses in applications requiring real-time motion quantification of a signal in a video.

公开(公告)号：US09721180B2

公开(公告)日：2017-08-01

申请号：US14969147

申请日：2015-12-15

Applicant: Xerox Corporation

Inventor： Prathosh A. Prasad ,  Lalit Keshav Mestha ,  Himanshu J. Madhu

IPC: G06K9/00 ,  G06K9/46 ,  A61B5/00 ,  A61B5/08 ,  G06K9/40 ,  A61B5/113 ,  A61B5/11

CPC classification number: G06K9/4647 ,  A61B5/0013 ,  A61B5/0077 ,  A61B5/08 ,  A61B5/1128 ,  A61B5/1135 ,  A61B2576/00 ,  G06K9/0053 ,  G06K9/00751 ,  G06K9/40 ,  G06K9/4661 ,  G06K2209/05 ,  G06T7/0012 ,  G06T7/20

Abstract: A video is received of a region of a subject where a signal corresponding to respiratory function can be registered by a video device. Pixels in the region in each of the image frames are processed to identify a respiratory pattern with peak/valley pairs. A peak/valley pair of interest is selected. An array of optical flow vectors is determined between a window of groups of pixel locations in a reference image frame corresponding to a peak of the pair/valley pair and a window in each of a number of image frames corresponding to the respiratory signal between the peak and ending at a valley point. Optical flow vectors have a direction and a magnitude. A ratio is determined between upwardly pointing optical flow vectors and downwardly pointing optical flow vectors. Based on the ratio, a determination is made whether the respiration phase for that peak/valley pair is inspiration or expiration.